Abstract: Method for manufacturing terephthalic acid includes following steps: providing a titrant receptor solution, the titrant receptor solution being water; adding disodium terephthalate aqueous solution and an acid titrant into the titrant receptor solution to form terephthalic acid crystals and an end-point solution, and separating the terephthalic acid crystals from the end-point solution.

Abstract: Method for manufacturing terephthalic acid includes following steps: providing a titrant receptor solution, the titrant receptor solution being water; adding disodium terephthalate aqueous solution and an acid titrant into the titrant receptor solution to form terephthalic acid crystals and an end-point solution, and separating the terephthalic acid crystals from the end-point solution.

Abstract: A copolyester resin for preparing a low-melting copolyester fiber is made by compounding a first copolyester with a second copolyester in a weight ratio of the first copolyester to the second copolyester of from 94:6 to 98:2. The first copolyester is obtained by subjecting terephthalic acid, ethylene glycol, isophthalic acid, and diethylene glycol to a copolymerization, and the second copolyester is obtained by subjecting terephthalic acid, ethylene glycol, and neopentyl glycol to another copolymerization.

Abstract: A method of producing a phosphinyl carboxylic ester is provided. First a phosphinyl carboxylic acid is provided, then a diol is added to the phosphinyl carboxylic acid. Later, the phosphinyl carboxylic acid undergoes a condensation reaction with the diol in the presence of a basic compound to obtain a phosphinyl carboxylic ester mixture. The phosphinyl carboxylic ester mixture includes a phosphinyl monoester and a phosphinyl diester.

Abstract: A method for manufacturing a fluorine-free water repellent includes: mixing a paraffin, an inorganic nanopowder and a first reactive monomer to form a first mixture, in which the first reactive monomer includes a structure represented by formula (A), formula (B) or a combination thereof, the formula (A) is wherein X1 is a benzene, and the formula (B) is wherein X2 is CH3 or H and X3 is an alkyl group having 18 or more carbon atoms; mixing an emulsifier, a cosolvent and water to form a second mixture; mixing the first mixture and the second mixture to form a pre-emulsion; and adding an initiator and a second reactive monomer into the pre-emulsion, in which the first reactive monomer and the second reactive monomer are polymerized to form a water repellent, wherein the second reactive monomer is vinylidene chloride.

Abstract: A method for manufacturing terephthalic acid includes the following operations: providing a raw material, in which the raw material includes a first raw material including polyethylene terephthalate; performing a depolymerization reaction on the first raw material to form a depolymerization product, in which the depolymerization product includes disodium terephthalate; performing a decolorization process on the disodium terephthalate to form decolorized disodium terephthalate and precipitated sludge; separating the decolorized disodium terephthalate and the sludge; and forming terephthalic acid from the decolorized disodium terephthalate after separating the decolorized disodium terephthalate and the sludge.

Abstract: A method for manufacturing terephthalic acid includes the following operations: providing a raw material, in which the raw material includes a first raw material including polyethylene terephthalate; performing a depolymerization reaction on the first raw material to form a depolymerization product, in which the depolymerization product includes disodium terephthalate; performing a decolorization process on the disodium terephthalate to form decolorized disodium terephthalate and precipitated sludge; separating the decolorized disodium terephthalate and the sludge; and forming terephthalic acid from the decolorized disodium terephthalate after separating the decolorized disodium terephthalate and the sludge.

Abstract: A copolyester resin for preparing a low-melting copolyester fiber is made by compounding a first copolyester with a second copolyester in a weight ratio of the first copolyester to the second copolyester of from 94:6 to 98:2. The first copolyester is obtained by subjecting terephthalic acid, ethylene glycol, isophthalic acid, and diethylene glycol to a copolymerization, and the second copolyester is obtained by subjecting terephthalic acid, ethylene glycol, and neopentyl glycol to another copolymerization.

Abstract: A polyester based blend includes: a polyester to be formed into a polymer matrix for a packaging article when the polyester based blend is melted and extruded; an oxidative catalyst to be dispersed in the polymer matrix; and an additive of an aldehyde that is to be dispersed in the polymer matrix, that is catalytically reactive with oxygen at room temperature in the presence of the oxidative catalyst, and that has a melting point greater than room temperature. A packaging article made from the melt-extruded polyester based blend is also disclosed.